Having come from a decade of driving an AWD 300C Hemi, it's interesting to have my first vehicle that has switchable 2WD/4WD. I've had my Ram for several months now, and am starting to use the 4WD a bit. I basically run in 2WD. But I've noticed in the rain that I can get unnecessary rear wheel spin when taking off from a red light etc, and now in the rain I run in 4WD auto. I haven;t researched enough yet, but I am wondering what is the benefit/detriment in my usage to run either 4WD auto or 4WD lock. I figure if I want to ensure good traction in wet conditions why not just use 4WD lock. I certainly know come winter I'll be in 4WD a bit, and by then I will have learned thoroughly about the variants in 4WD. Since I don't off-road, I can't see me using 4WD low much, if ever.